Nitrogen is the 2010's version of rustproofing. It is a massive money maker for the dealer. In a perfect world is it better? Yes. Nitrogen will not vary much in density through temperate changes and as such the pressure will not fluctuate. In real world practice you will see an average total drop/rise of 50 degrees from summer to winter in the northeast, or roughly a 5 degree change in tire pressure. If you are the type of person who never checks your tire pressure then nitrogen will be better for you, but if you are smart and you do periodically check your pressure then nitrogen is a waste of money. At $75+ it is pure profit....

I agree with Emilner, last time I checked the atmosphere is 78-79% Nitrogen so filling your tires with air effectively fills your tire up with nitrogen...